Connecting-rod bearing



2 Shee tsSheet 1 1 Inventor:

J. KUHNE CONNECTING ROD BEARING Filed Sept. 24. 1925 Jan. 4', 1927.

1 612,824 Jan. 4 1927. J KUHNE- v CONNECTING ROD BEARING Filed Sept. 24.1925 2 Sheets-Sheet 2 Inventor? Patented Jan. 4, 1927.

UNITED STATES I 1,612,824 PATENT OFFICE,

JOSEPH KUHNE, OF ISERLOHN, GERMANY.

CONNECTING-ROD BEARING.

Application filed September 24, 1925, Serial No. 58,424, and in GermanySeptember 23, 1924.

The invention relates to the connection of the connecting-rod with thereciprocating press-carriage in machines for vmanufacturing rivets,screws, wire-nails, balls and the like of the kind in which theconnectingrod is journalled on the carriage by means of two sidejournals and is simultaneously supported on the carriage by means of thefront face of its bearing end. The invention consists essentially inthat the cylindrically shaped front face of the bearing end of theconnecting-rod is curved to the same radius as the outer surfaces of thejournals so that the latter as well as the connectingrod itself arejournalled and supported in a continuous bearing of uniform width. Theresult is thereby obtained that, on the one hand, the head of theconnecting-rod and the rear portion of the carriage which receives andsupports it may be ofparticularly small dimensions and, on the otherhand, the construction of the rear portion of the carriage isfacilitated in that the bearing which is provided in it for the head ofthe connecting-rod need neither be reduced in size nor need its ends befitted with separate journal-rings or bushes for the bearings of theconnecting-rod journals. In order that the rear portion of the carriageneed not be divided for the introduction of the connecting-rod, the twojournals of the connecting-rod are made, according to the invention, intwo parts separate from the connecting-rod and fitted to it fromopposite sides. The result is thereby also obtained that the liningwhich is arranged in the bearing and extends in common over the twojournals and the front surface of the head of the connecting rod may bemade in one piece. My invention aims to provide a full bearing for thehead of the connecting rod which is not only of greater length than thewidth of the head of the rod, and which extends also from side to sideof the member to which the rod is coupled but in which the sectionalwrist-pin employed includes as part thereof the two end bearing members,and consists of a minimum number of complemental parts, preferably notmore than two, in order to reduce the cost of construction and theamount of working time necessary in assembling or disassembling abearing. My invention further aims to make the construction of thehearing such as to avoid the necessity of forming a connecting bearingrod eye of excessive size or wall.

thickness, while at the same time so constructing the wrist-pin that theeye will embrace a portion of the pin which is of substantial thickness,in order that the pin will be of suflicient strength to resist fractureor deflection under pushing and pulling strains, and will be soreinforced and braced as to ensure a smooth and true working of theparts of the bearing surfaces against one another.

Two constructional embodiments of the invention are illustrated by wayof example in the accompanying drawings in which:

Figure l is an elevation, partly in section, showing one form of theinvention.

Figure 2 is a plan view, partly in section, of the same. 7

Figure 3 is a view similar to Figure 1 showing a modified construction.

Figure 4 is a View similar to Figure 2 of the modification shown inFigure 3.

Referring to the drawings, a represents the reciprocating carriage ofthe press and b the connecting-rod by which it is moved and which, inmanner known per se, is journalled by means of two end bearing membersor journals 0, d in the carriage a, of which the rear end is partlyforked. In order that the pressure may be transferred to the carriage adirectly by means of the connecting-rod as well as by the journals thefront face fof the bearing eye 6 of the connecting-rod b is ofcylindrical shape and is supported against an approximatelysemi-cylindrical recess in the carriage a. The front face 7 of theconnecting-rod is curved to the same radius as the outer surfaces of theend hearing members or journals cv (Z whereby the result is obtainedthat the supporting surface for the arm of the connecting-rod can beformed, as illustrated, directly by the central portion of the wall ofthe transverse bore or bearing in the carriage which holds the journals0, (Z, which bore only needs to possess an opening for the passage ofthe connecting-rod in that half which is adjacent to the rear end of thecarriage while the other half may on the contrary remain unbroken. Thetransverse bore or bearing in the carriage is provided as usual with abushing or lining g which not only surrounds the journals but alsoextends over that portion of the bore in the carriage which forms thesupporting surface for the connecting-rod.

order that the rear portion of the car riasze 0. containing; the bearingfor the connecting-rod need notbe divided for the purpose of introducingthe connect lug-rod 72 and its journals 0, d, and in order also that alining or journaled-box g which is made in only one piece may beemployed, the two journals are formed in two parts which are separatefrom, the connecting-rcd and are fitted on to it from opposite sides. Inthe example illustrated in Figs. 1 and 2. the connecting-rod is providedon one side, with a solid journal having a reduced stem or pin portion 0which engages in and is tightly fitted in the circular bore of theconnecting-eye, while the journal on the other side consists of a ringhaving an internalthre-ad which is screwed on to the externally threadedend 0 of the stem 0 which projects out of the connecting-rod. In orderto prevent the screw connection from. unintentionally becoming loose alockingdevice of a type well known per seprovided which consists, forexample, of tongue it which is fired by means of a screw to the end 0 ofthe journal 0 and engages also in recesses in the journal 0 and the rin(Z.

In order also to: prevent the journals 0, d from rotating; there isfitted a keyz' which engages in grooves in the wall of the bore in theconnectingrod Z) and in the reduced portion. a of the journal 0. Thelining g is likewise prevented from rotating in the bore of the carriageo by means of a key 7-: which is similarly arranged;

The construction above-described provides a wrist-pin consisting of endbearing members a, (Z, and a reduced intermediate portion. 0 connectingsaid members, which portion 0 receives and is surrounded by the eye I)of the connecting rod 6, which eye lies between the bearing members aand (Z; In order to provide a Wristpin consisting of but twoparts, asdescribed, and which is sufficiently strong to resist deflection underthe working movements of the connecting rod Z), the stem 0' is formedintegral with the bearing member 0, and while of reduced diameter withrespect to both bearing members, is yet of fairly large diameter so thata connecting stem of adquatc strength between the two bearing memberswill be prod need. The eye I) of the rod 7) is of a wall thicknessi'uateriall less than the dian'ieter cl the-stem c and is of a wallthickness corresponding to the difference between the diameter of thestem and the end bearing members,'so that the outer surface of the eyewill lie flush with the outer surfaces of the end hearing members andform therewith a continuous tearing surface of the same radiusthroughout the length of the bearing for contact with the bearingsurface of the bushing 9. As in practice the eye of the connecting rodmay be made of comparatively thin. wall thickness, because of the extentof the bearing surface, the reduced portion f the wrist-pin extending:between the r inn; members 0 and (6 may be made of s diameter as toafford the necessary strength against its deflection under pressures andstrains in the motion of the connecting rod, whereby the bearing members0 and (Z are reinforced, which: action is si-ipplementcd by the bearingcontact of the eye I) in the hearing surface of the bushing, so thattilting: or ca'ntiug of the bearingmembers 0 and d in the bushingwill beprevented, an accurate centering of the bearing surfaces maintained, andunequal wear on such surfaces avoided;

The example illustrated in Figs. 2:3 and l is simpler than that of Figs.1 and 2 in that the screw connection of the two journals is omitted. Inthis. case both end journals or hearinginembers c cZ have reduced endsor stem, portions c-d vhich extend from opposite sides into. thetranverse bore in the connecting-rod b and are interlocked therewith bymeans of a groove and a spring or key 11. One of the; journals, as theone at, is provided with an axial pin-like extension c! which projectsinto and engages a. longh tudinal recess in the other journal 0 and isprovided at its end, which lies outside the latter journal, with a holein which a split pin orcotter m, which connects the two journalstogether in the axial direction, is inserted. a result of thisconstruction, it will be seen that a two-part wrist-pin is proridedconsisting of the end bearing Inemhers c -(Z having a reduced portionformed by the stems 0""(Z*,, which are bridged and surrounded by thebearing eye of the connecting rod Z9, together with a projection orfastening: element cZ integral with and projecting from the bearing;member (Z and extending through the stem 0 and body of the bearingmember The stems c and d form a reduced intermediate portion of thewrist-pin which is of comparatively large diameter, conformable withthat of the stem 0 of the bearing; member 0 shown in Figures 1 and 2,and of sufiicient diameter to enable a locking projection d ofsntficient diameter for a firm interlocking connection between thetwocoupling members to be formed, By this construct-mu also a wrist-pinhaving all the advantages of that disclosedin Figures 1'. and 2 isproduced, in which a strong and durable construction of two-partwrist-pin is provided tosustain the working strains, to reinforce andbrace the eye of the connecting rod and to hold the end bearing membersagain-st deflection so that an accurate engagement between the bearing;surfaces of the carriage a and connecting rod 6 will be maintained.

U-bviously, various other forms of construction are possible withoutdeparting from the invention.

Having now particularly described and ascertained the nature of my saidinvention, and in what manner the same is to be performed, I declarethat what I claim is 1. In a connecting rod bearing, a member having abore extending between opposed faces thereof and provided with a bearingsurface, a. two-part wrist-pin arranged within said bore and presentingopposite end hearing members and a reduced intermediate portion, onepart of said pin including a connecting element extending through andinterlocked with the other part of said pin, and a rod having an eyesurrounding and interlocked with the reduced intermediate portion of thepin and lying between the end bearing members thereof, said eye having awall thickness materially less than the diameter of the reduced portionof the wrist pin which it encloses, said end bearing members and eyepresenting a continuous outer bearing surface of like radius throughoutfor engagement with the bearing surface of the bore.

2. In a connecting rod bearing, a. member having a bore extendingbetween opposed faces thereof and provided with a bearing surface, atwo-part Wrist-pin arranged within said bore and presenting opposite endbearing members and a reduced intermediate portion, said reducedintermediate portion consisting of complemental reduced extensions ofsaidv end bearing members, the extension of one bearing member having aprojection extending axially through the other bearing member and in itsextension and being interlocked therewith, and a rod having an eyebridging and surrounding said reduced portion formed by said extensionsof the end bearing members and lying between and in contact with saidend bearing members, said eye having a wall thickness materially lessthan the diameter of the reduced portion of the wrist-pin which itencloses, said end bearing members and eye presenting a continuous outerbearing surface of like radius throughout for engagement with thebearing surface of the bore.

In testimony whereof I affix my signature.

JOSEPH KUHNE.

